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How do you replace a heater core on a 1998 chevrolet blazer

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  • deborah1100 Feb 04, 2010

    Is there some type of diagram that will help me.

  • deborah1100 Feb 04, 2010

    what book are you suggesting i buy? And where do I get it?

  • deborah1100 Feb 04, 2010

    i need to replace a heater core on a 1998 chevrolet blazer. is there a diagram or some type of pictures to help do this if so please send them to me and if not please tell me how

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  • Chevrolet Master
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1. Remove the front dash panel by turning the lower screws in a counter-clockwise direction, then unscrewing the single bolt on the lip of the instrument cluster and pulling the panel out. Remove the rear wiper switch and the 4x4 switches, if applicable. Lowering the tilt wheel will allow the panel to be totally removed.
2.Remove the radio, headlight switch module and glove box by turning their screws in a counter-clockwise direction.
3.Remove the main dashboard by unbolting it at the front, between the windshield and firewall. There are six to eight bolts holding it in, and, once they are removed, the dash can be pulled away from the firewall. Be careful not to pull too much, as the wiring harness could become damaged.
4.Drain the coolant system by turning the drain plug on the lower left corner of the radiator and allowing the fluid to fall into the drain pan. Uncapping the radiator can reduce the internal pressure.
5.Remove the heater core hoses, on the upper left of the engine bay, by pinching their hose clamps with a pair of pliers and pulling them off. Some models will have screw-type hose clamps; turning them counter-clockwise will loosen them. Age and heat may have stuck the hoses to the core nipples, and the hoses can be cut right at these nipples if necessary. Leave enough hose to reconnect the new core.
6.Unbolt the heater core's mounts with a socket wrench in a counter-clockwise direction. Once the bolts are free, the heater core can be maneuvered toward the windshield and slid out. Some coolant may splash out, so have a towel handy.
7.Replace the heater core with a new one by sliding it into place and securing the mounting bolts.
8.Reconnect the heater core's hoses, turn the radiator's drain plug clockwise to close it, then refill the coolant system with a 50/50 percent mix of coolant and water.
9.Reconnect the dashboard to the firewall, then replace the front dash panel and fasten its instrument cluster screw and bottom bolts.
10. Start the Blazer and add coolant until the heater core is filled and blowing hot air.
11.Replace the radiator cap.
If your heater core is not leaking, and just clogged. Try flushing it out with water by disconnecting the two heater core hose from the water pump. Make sure you don't add to much pressure through the system that you do damage the heater core. I have done this a few times with radiator flush to keep my heater core at 100%.
If your heater core has a small leak, try adding 3 table spoon of common kitchen black pepper to the colling system. The pepper will work it's way to where the leak is and should stop the leak as long as the hole is not to large. The good thing about the pepper is that it will not restrict the flow of coolant throughout your engine and leave no residue and will clean up nicely by just doing a normal coolant flush without any additives. The radiator stop leaks leave a residue throughout the cooling system and can restrict the flow of coolant throughout the engine. This can buy you some time so you can replace the heater core in the summer time.
Note: Give the pepper some time to work it's way through the cooling system and place the heat on the highest setting and when replacing the coolant. Make sure it's a 50/50 mix water/dex-cool. too much water will boil over in the summer and freeze in the winter and to much antifreeze will gel up cause over heating due to coolant restriction.
Good luck and keep me posted and take pictures with your cell phone to use as reference when putting things back together.

Posted on Feb 04, 2010

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  • Master
  • 10,319 Answers

The heater core is located slightly right of the center of the dashboard, bolted to the firewall. (behind radio, vents, etc) I just did this myself, and it is NOT a quick and easy job. You need to buy the book for this job as you need to remove the entire dash board, unbolt the core cover, then the braces, and the core itself. I didn't need to drain the coolant as they reccomended, nor did i need to empty the ac unit. After you get the dash to pivot backwards, pray you can get to it without having to completely remove as the wiring harnesses are a serious pain. Good luck.. Buy the book, and don't make plans for the weekend. Careful disassembly is the key. I used a cardboard box with diagrams to remember where the screws and nuts went (I stick the screws into the box diagram where they go). Also for some of the component pieces you will want to use ziplock baggies to keep those parts together. This is not a hard job. It is very time intensive though. Realistically, I would plan for 16 hours of actual work (unless you have done it before, then cut the time in half). Power tools or air tools will dramatically decrease the time.

Posted on Feb 04, 2010

  • frank thomas wilson
    frank thomas wilson Feb 04, 2010

    The Chilton manual helped me quite a bit. I changed the heater core on my wife's 96 Blazer. It involves removing the entire dash. It is a very long and involved process and should only be attempted if you are a fairly good mechanic. I have a 98 Blazer and the process is not the same for this vehicle. On the 98, the firewall must be cut to access the heater core.

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